Status and perspectives of PAMELA experiment for indirect dark matter search

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1 Focus week on Indirect Dark Matter Search December 07-11, 2009 Status and perspectives of PAMELA experiment for indirect dark matter search M. Casolino INFN & University of Roma Tor Vergata on behalf of the PAMELA collaboration

2 Cosmology Detection, not identification Dark Matter Searches LHC Search Supersymmetry, not necessarily DM 1E Bullet Cluster Direct Detection Local structure and nature DAMA Indirect Detection Various galactic scales Galactic centre Antiprotons: Galactic average positrons: Local galactic 1kpc

3 Different approaches to search for Dark Matter PAMELA LHC FERMI Adapted from P. Lipari UNDERGROUND

4 Another problem: Matter / Antimatter Asymmetry in the Universe

5 Sakharov conditions 1) Direct violation of barionic number particle X decays breaking barion symmetry 2) CP violation to avoid specular antiparticle decay 3) Non thermal equilibrium at a given time To avoid barion compensation through inverse processes Sakharov, A.D. 1967, J. of Exper. and Theo. Phys. Letters, 5, 24-28, Violation of CP Invariance, C Asymmetry, and Baryon Asymmetry of the Universe (Russian: Андре й Дми триевич Са харов) (May 21, 1921 December 14, 1989)

6 Matter Antimatter domain separation? -ray 0.1 GeV from annihilation in boundary regions Current limit: separation above cluster of galaxy (> 10 Mpc) Steigman, G. 1976, Ann. Rev. Astron. Astrophys. 14, 339, Observational tests of antimatter cosmologies Observable? Magnetic fields? Survival probability? Ahlen, S.P. et al. 1982, ApJ, 260, 20, Can we detect antimatter from other galaxies? M33

7 Discovery of antiprotons in cr, 1979 p/p ratio 6 x GeV From Robert E. Streitmatter Bogomolov, E.A. et al. 1979, Proc. 16th ICRC, Kyoto, 1, 330, A Stratospheric Magnetic Spectrometer Investigation of the Singly Charged Component Spectra and Composition of the Primary and Secondary Cosmic Radiation

8 Antihelium search Probability to produce antinuclei in cosmic rays is negligible. AntiHe could be produced in Big Bang. Look in cosmic rays Up to now only upper limit BESS has current world record He He n p n p Ref.: M. Sasaki et al. at COSPAR-2006

9 Pamela Physics objectives in the Hillas Plot Collider Direct e + / e - P / P -

10 High precision charged cosmic ray measurement in Low Earth Orbit Adapted from Simpson 1983 in PDG by M. Casolino

11 Time of Flight (three scintillators, 6 planes, 48 phototubes) Magnetic (0.46T) Spectrometer Microstrip detector (6 double sided microstrip planes) Silicon Tungsten Tracking Calorimeter (44 planes of 96 strip) Shower Catcher Scintillator Neutron Detector Anticounter System RESURS DK1 SATELLITE (6.65T)

12 Coupling to Soyuz Pamela during integration in Baikonur Resurs DK integrated

13 The PAMELA apparatus Spatial Resolution 2.8 µm bending view 13.1 µm non-bending view MDR from test beam data 1 TV Calorimeter Performances: p/e + selection eff. 90% p rejection factor 10 5 e - rejection factor 10 4 ND p/e separation capabilities >10 above 10 GeV/c, increasing with energy GF ~20.5 cm 2 sr Mass: 470 kg Size: : 120x40x45 cm 3 Power Budget: 360 W

14 e GV Bending view e GV Bending view

15 PAMELA event Flight data: 14.4 GV non-interacting proton From E. Mocchiutti

16 PAMELA event Flight data: 36 GV interacting proton

17 Flight data 84 GeV/c interacting antiproton

18 Flight data: 2.8 GV electron

19 Flight data: 92 GeV/c positron

20 The geomagnetic field is an extremely powerful tool to select particle of different origin and nature and study in situ MHD phenomena

21 Pamela maps at various altitudes

22 Selection of galactic component according to geomagnetic cutoff R cutoff =14.9GV/L 2

23 Proton and Helium Absolute flux Montecarlo efficency for cuts Trigger efficiency Tracking efficiency Multiple Scattering Correction for energy loss in det Back scattering Systematics under close investigation, currently about 1-2% uncertainty on abs flux. Selection criteria Fitted, single track High lever arm, Nx Rigidity R>0 Beta>.2 No anti Energy loss from tracker Beta = v/c (from TOF) antiparticles albedo particles p d particles albedo antiparticles Rigidity (from Tracker) Li He Rigidity (from Tracker)

24 Solar modulation at minimum of solar cycle XXIII years Rome Monthly neutron monitor A- A+ A- A+ A- Pamela AMS-01 Caprice / Mass /TS93 BESS

25

26 Low Solar Activity high particle flux Energetic iron nuclei counted by the Cosmic Ray Isotope Spectrometer on NASA's ACE spacecraft reveal that cosmic ray levels have jumped 19% above the previous Space Age high.

27 Time evolution of Pamela low energy proton flux Dec 2006 event Pamela MV

28 Solar modulation is effective below 10 GeV

29 Solar modulation at minimum of solar cycle XXIII years F is = 1.54 is 0.7 R is p/(cm 2 s sr GV) J Spectral index E E0 ( r, E, t) ( E ( t)) E0 J(, E ( t)) increasing particle Flux (jul06 aug07) Solar modulation parameter (GV) JUL e-03 JAN AUG But Spherical approximation is not sufficient for charge dependent solar modulation

30 Proton and Helium spectra, kinetic energy, Jul 2006 preliminary P: 2% fitting error

31 Comparison with other experiments preliminary proton He

32 Comparison with other experiments *E^275 preliminary Different spectral indexe For He and P

33 Preliminary Pam p Pam He Spectral indexes should change around 1 TeV

34 Preliminary results at high energy The results: Galactic fluxes -2 Still preliminary Some MC corrections MDR cut Deconvolution needed Protons Helium He =2.682±0.014 Limit of spectrometer is in rigidity R=p/Z=p nuc A/Z half Kinene/n for He 1200 GeV (p) 600 GeV/n (He)

35 Trapped proton flux in the Van Allen belt (South Atlantic Anomaly) Arxiv v1 P/(cm^2 sr GeV s) Trapped Turquoise 0.3 G < B Yellow 0.22 G < B < 0.23 G Blue 0.21 G < B < 0.22 G Green 0.20 G < B < 0.21 G Red 0.19 G < B < 0.20 G Black B<0.19 G Galactic Integral Pamela flux (E>35 MeV) (PSB97 plot by SPENVIS project, model by BIRA-IASB) A E ( 0 1E ) nero rosso verde A 0.11±0.01 (2.3±0.3) 10-2 (5±3) 10-4 γ 0 6.0± ± ±1.8 γ 1 3.1± ± ±1.8 GeV χ 2 /ndf

36 Trapped proton flux in the Van Allen belt Comparison with models S W Pamela Model R. S. Selesnick,1 M. D. Looper,1 and R. A. Mewaldt2 SPACE WEATHER, VOL. 5, S04003, doi: /2006sw000275, 2007

37 Primary (galactic) spectra: polar measurements P/(cm^2 sr GeV s) Galactic protons M. Honda, 2008 RED: JULY 2006 BLUE: AUGUST 2007

38 Primary and secondary spectra: Intermediate latitudes P/(cm^2 sr GeV s) Penumbra M. Honda, 2008 Secondary particles (reentrant albedo) RED: JULY 2006 BLUE: AUGUST 2007

39 Primary and secondary spectra: Magnetic equator P/(cm^2 sr GeV s) Penumbra M. Honda, 2008 Secondary particles RED: JULY 2006 BLUE: AUGUST 2007

40 Secondary (reentrant albedo) proton flux at various cutoffs Atmospheric neutrino contribution Astronaut dose on board International Space Station Indirect measurement of cross section in the atmosphere --- M. Honda, 2008 Arxiv v1

41 Alignment Critical Issue: an antiparticle Can be faked if alignment of the detector is wrongly considered Incoherent misalignment Correction with protons 2 steps: column alignment + inter-column alignment Coherent misalignment Correction with electrons (or electrons + positrons) and comparison with simulation From E. Vannuccini, P. Papini

42 Proton spillover background MDR > 850 GV Protons (& spillover) Minimal track requirements Strong track requirements: strict constraints on 2 (~75% efficiency) rejected tracks with low-resolution clusters along the trajectory - faulty strips (high noise) - -rays (high signal and multiplicity) Antiprotons From O. Adriani

43 High-energy antiproton selection p-bar p R < MDR/10 10 GV 50 GV From O. Adriani

44 Antiproton ratio measured with Pamela: Comparison with theoretical models Released data GeV Currently roughly 10 TB of data Uncertainties in heliospheric propagation As of March 08 Out of 8.8 TB Uncertainties in Galactic propagation 10 7 p 800 p -

45 Antiproton ratio measured with Pamela: Comparison with experimental data Highest energy up to now Coherent with secondary production Uncertainties of Galactic Propagation Would favour Moskalenko 2002 (except highest energy) ApJ 457, L ApJ 532, 653, 2000 arxiv: v1 [astro-ph] 28 Oct 2008 PRL

46 Antiproton ratio New preliminary antiproton/proton ratio PAMELA (preliminary) PAMELA PRL 102 (2009) New points consistent with old ones.

47 Preliminary antiproton spectrum Preliminary (preliminary) highest bin: MDR > 6 R is used to increase statistics..

48 Preliminary antiproton spectrum Preliminary Preliminary - Evaluation of systematics is under way.

49 Preliminary p-bar spectrum Preliminary antiproton spectrum Preliminary

50 Preliminary antiproton spectrum F. Donato et al., Ap.J (2001), =500MV, with indeterminacy of the diffusion (black line) and nuclear (blue line) parameters.

51 Positrons results Till August 30 th about positrons from 200 MeV up to 200 GeV have been analyzed More than positrons over 1 GeV Other eight months data to be analyzed Selection criteria based on calorimeter Tuned and tested with Montecarlo Test Beam In flight data Cross-checked with Neutron Detector

52 Preshower Technique to reduce systematics of proton contamination: Optimize electromagnetic/hadronic shower discrimination, reduce systematics Protons: Non Interacting Interacting Electrons / Positrons Interacting (e.m.) Recipe: M. Boezio, E. Mocchiutti

53 Positron selection with calorimeter (1) Rigidity: GV e - p (int) p (non-int) p (non-int) p (int) e + Fraction of charge released along the calorimeter track (left, hit, right)

54 Positron selection with calorimeter (2) Rigidity: GV e - p e + Fraction of charge released along the calorimeter track (left, hit, right) + Energy-momentum match

55 Positron selection with calorimeter (3) Rigidity: GV e - p e + Fraction of charge released along the calorimeter track (left, hit, right) + Energy-momentum match + Starting point of shower Longitudinal profile

56 Positron selection (4) Indipendent selection/check with ND Fraction of charge released along the calorimeter track (left, hit, right) e - Rigidity: GV Neutrons detected by ND e - p e + e + p Energy-momentum match Starting point of shower

57 Pamela positron fraction July 2006 February 2008 (~500 days) Collected triggers ~10 8 Charge dependent solar modulation Identified ~ electrons and ~ positrons between 1.5 and 100 GeV (180 positrons above 20 GeV ) increase over background arxiv: v1 [astro-ph] 28 Oct 2008 Nature 458, (2 April 2009)

58 Pamela positron fraction: comparison with other data Nature 458, (2 April 2009)

59 Various approach to background subtraction Data: July 2006 December 2008

60 More positrons data up to December 2008 New data + systematic error Data: July 2006 December 2008

61 Secondary production Dark Matter Decay Astrophysical sources, SNR

62 EDSJO 2009

63 Positron origin Where do positrons and electrons come from? Mostly locally within 1 Kpc, due to the energy losses by Synchrotron Radiation and Inverse Compton They sample the neighborhood of the galaxy Protons and antiptotons the whole galaxy Typical lifetime

64 Astrophysical Origin Pulsars Must be young (T<10 5 yr) and nearby (<1 kpc). If not: too much diffusion, low energy, too low flux. Injection flux:

65 Exotic Origin Bergstrom 2009

66 Positron fraction: comparison with models Pulsar Component Yüksel et al. 08 Pulsar Component Atoyan et al. 95 KKDM (mass 300 GeV) Hooper & Profumo 07 Pulsar Component Zhang & Cheng 01 Secondary production Moskalenko & Strong 98

67 Charge dependent solar modulation of low energy positrons Charge dependent solar modulation Separate qa>0 with qa<0 solar cycles Evident in the proton flux Observed in the antiproton channel by BESS Full 3D solution of the Parker equation drift term depends on sign of the charge Pamela AMS-01 Caprice / Mass /TS93 BESS A<0 (now) p-,e- Miyake, Yanagita, 2008 A<0 (now) p,e+ A + A -

68 Charge dependent solar modulation A + A - Pamela Pamela e+ Pamela p- Clem et al. 30th ICRC 2007

69 Fermi seems to exclude Egret excess Porter, Icrc 2009

70 Fermi Haze as IC counterpart of WMAP Wmap haze in synchroton rad Toward glactic center ApJ, 614: , 2004 October 10 arxiv: v1

71 Electrons and positrons are fashionable But there is disagreement on the e + +e - spectrum Atic: Balloon but deep detector BGO calorimeter, ATIC 1+2, 18.4 rl, in 4 XY, planes, ATIC 4, 22.9 rl, in 5 XY planes, Fermi: Large statistics (400 events in last bin) but shallow: 12.5 X 0

72

73

74 Egberts, 2009 HESS electrons

75 PAMELA electron flux preliminary

76 Comparison with other experiments preliminary Still work in progress high at low energy (consistent with charge dependent solar modulation) Low at high energy (only electrons)

77 preliminary Still work in progress Hint of a change in power law spectrum Might be consistent with e+ component

78 Search for exotic matter: Strangelets (Lumps of Strange Quark Matter) Roughly equal numbers of u,d,s quarks in a single bag of cold hadronic matter. u,d,s quark matter might be stable Not limited in A A=100, Z is almost zero due to cancellation of quark charge Z=2 A=4 (He) Z/A=0.5 Z=2 A=7 7 Z/A=0.286 Could account for a (small) part of DM Also candidate of UHECR

79 Search for anomalous Z/A particles in cosmic radiation with PAMELA.3 sqrt 0.5 R Ordinary nuclei 0.3 R 0.8 Anomalous Z/A matter search region Tracker rigidity

80 Pamela is operating successfully in space Expected three years of operations completed Extended other 2 years Data received until now show good potential and fullfillment of scientific goals

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